Overnight Croque Monsieur Casserole - Martin's Famous Potato Rolls and Bread

Ingredients

• 1 Tablespoon Unsalted Butter, plus more to coat pan
• 1 Yellow Onion, roughly chopped (about 1 1/2 cups)
• 4 Cloves Garlic, thinly sliced
• Salt and Pepper, to taste
• 1 Tablespoon Fresh Thyme, roughly chopped, plus one teaspoon for garnish
• 8 Large Eggs
• 1 1/2 Cups Half-and-Half
• 2 Tablespoons Dijon Mustard
• 1/2 Teaspoon Hot Sauce, plus more for garnish
• 1 1/2 Teaspoons Kosher Salt
• 1 Loaf Martin’s Old-Fashioned Real Butter Bread, stale or toasted, cut into thick cubes
• 2 Cups Gruyere Cheese, shredded (about 4.5 ounces)
• 1/2 Pound Canadian Bacon, cut into 1/2-inch dice
• 1/4 Cup Parmesan Cheese, finely grated (about 1 ounce)